Hmmm...I will have to say that Cupcakes is a little more creepy than Rainbow Factory,mostly because Rainbow Factory is not really creepy but more like a drama...*SPIOLER ALERT* The ending is that Fluttershy kills discord and Rainbow Dash so it ended happy...or somewhat

Yes....but nobody expected thatv Pinkie will do that like "Oh RainowDash came to Sugercub Corner to have fun making Cupcakes,oh they are going to the basement...wait Rainbow Dash is tied up and gets killed and ripped into pieces and gets eaten by Pinkie Pie....I mean come on Pinkie is not that Crazy

Second, everyone knows all about Pinkie's...eccentric side and like I have stated before, Rainbow Dash is least expected to do it. And also Pinkie Pie Kept a straight face. Acting like she usually does except for the fact that everything was 10x creepier. In Rainbow Factory, Rainbow Dash became a swearing person, filled with anger and resentment. I don't blame her thought because if I had to live in her conditions, I would be like that too.